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Finding the Fourth Proportional to 101,320.80, 151,981.20 and 31,221.60

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Solution

The fourth proportional to 101,320.80, 151,981.20 and 31,221.60 is: 46,832.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,320.80 : 151,981.20 = 31,221.60 : x
  2. Step 2: Convert to fraction form
    101,320.80/151,981.20 = 31,221.60/x
  3. Step 3: Cross multiply
    101,320.80x = 151,981.20 × 31,221.60
  4. Step 4: Simplify right side
    101,320.80x = 4,745,096,233.92
  5. Step 5: Solve for x
    x = 4,745,096,233.92/101,320.80
  6. Step 6: Final answer
    x = 46,832.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.